The IOL Calculator is meant to serve as an adjunct tool to assist physicians in selecting the appropriate IOL for a particular patient. It is intended to be used in conjunction with a comprehensive ophthalmic examination and the appropriate diagnostic tests and measurements necessary for cataract surgery candidates with a history of prior refractive surgery. The results obtained by the calculator are not intended to serve as medical or surgical instruction from the ASCRS, or be definitive; nor can ASCRS guarantee that the results will be accurate in every case. Physicians who use the calculator must arrive at their own independent determinations regarding the proper treatment for their patients and are solely responsible for the refractive outcome. By using the IOL Calculator, you agree to waive and hold ASCRS and authors harmless from any claims you may have arising out of your use of this tool.

2013 Updates:

For myopic LASIK/PRK eyes, both the Atlas 9000 and Atlas 995 ring (annular) 0-3 mm values and the Atlas 9000 4-mm zone can be used.

For the adjusted Atlas and Wang-Koch-Maloney methods, the Shammas-PL IOL power calculation formula is now being used.

Because of the greater accuracy of the formulas that either use ΔMR only or require no prior data (these in columns 2 and 3), we have added an average IOL power for these columns alone.

For RK eyes, a method using the Oculus Pentacam has been added.

For RK eyes, a method using IOLMaster/Lenstar Ks has been added.

For eyes with prior hyperopic LASIK/PRK, the Shammas-PL IOL power calculation formula is now being used.

IOL power calculation in eyes that have undergone LASIK/PRK/RK

Warren Hill, M.D.
Li Wang, M.D., Ph.D.
Douglas D. Koch, M.D.

Version 4.6
Made possible by an unrestricted educational grant from Alcon Laboratories and
The ASCRS Foundation